Big Huge Thesaurus

addendum

noun

• supplement
• postscript
• matter

sounds kind of like

• adamantine
• adiantum
• admonition
• at one time
• attention
• attenuation
• automation
• automaton

rhymes with

• abolitionism
• absenteeism
• absolutism
• accustom
• activism
• adam
• adventuresome
• adventurism
• ageratum
• album
• alcoholism
• algorithm
• altruism
• alum
• aluminium
• aluminum
• amalgam
• amateurism
• americanism
• anachronism
• aneurism
• anglo-catholicism
• angstrom
• animism
• annum
• antagonism
• antebellum
• antemortem
• anthem
• anti-catholicism
• aphorism
• arboretum
• arcanum
• arianism
• arum
• astigmatism
• asylum
• atavism
• atheism
• atom
• authoritarianism
• autism
• autumn
• awesome
• balsam
• bantam
• baptism
• barbarism
• barnum
• bedlam
• belgium
• bilingualism
• blossom
• bolshevism
• boredom
• bosom
• bothersome
• bottom
• botulism
• brougham
• buddhism
• burdensome
• burnham
• buxom
• cannibalism
• capitalism
• carborundum
• careerism
• cataclysm
• catechism
• catholicism
• centralism
• chasm
• chauvinism
• christendom
• chrysanthemum
• classicism
• collectivism
• colonialism
• column
• commercialism
• communism
• condom
• confucianism
• conservatism
• conservativism
• consumerism
• conundrum
• corundum
• counterterrorism
• creationism
• criticism
• cronyism
• cubism
• cumbersome
• curriculum
• custom
• cynicism
• cytoplasm
• dandyism
• darwinism
• datum
• decorum
• defeatism
• deism
• denim
• despotism
• determinism
• diamagnetism
• diastrophism
• dictum
• dimorphism
• diverticulum
• dogmatism
• druidism
• dualism
• dukedom
• duodenum
• durum
• dwarfism
• dynamism
• earldom
• ecosystem
• edam
• egalitarianism
• egoism
• egotism
• elam
• electromagnetism
• elitism
• emblem
• embolism
• emotionalism
• empiricism
• enthusiasm
• environmentalism
• eprom
• ergotism
• eroticism
• escapism
• ethnocentrism
• euphemism
• evangelism
• expansionism
• expressionism
• extremism
• fanaticism
• fascism
• fatalism
• fathom
• favoritism
• fearsome
• federalism
• feminism
• ferromagnetism
• fetishism
• feudalism
• fiefdom
• flagellum
• flotsam
• formalism
• forum
• foursome
• freedom
• fulcrum
• fulsome
• fundamentalism
• futurism
• geotropism
• gingham
• gnosticism
• golem
• gresham
• gruesome
• gypsum
• handsome
• hansom
• harem
• harlem
• hedonism
• hellenism
• heroism
• hinduism
• hokum
• hoodlum
• hooliganism
• humanism
• hypnotism
• iconoclasm
• idealism
• imperialism
• impressionism
• individualism
• internationalism
• interregnum
• irksome
• irredentism
• ism
• isolationism
• isomorphism
• item
• jainism
• jansenism
• jerusalem
• jingoism
• journalism
• judaism
• kingdom
• lanthanum
• laudanum
• leftism
• legalism
• leninism
• liberalism
• lipscomb
• loathsome
• logarithm
• lonesome
• lyricism
• macadam
• madam
• madame
• maelstrom
• magnetism
• magnum
• mannerism
• martyrdom
• marxism
• masochism
• materialism
• maxim
• maximum
• mccarthyism
• mechanism
• meddlesome
• memorandum
• mercantilism
• mesmerism
• metabolism
• methodism
• microcosm
• microorganism
• militarism
• minimalism
• minimum
• mitchum
• modem
• modernism
• modicum
• molybdenum
• momentum
• monasticism
• monetarism
• monism
• monotheism
• moralism
• moslem
• muharram
• multiculturalism
• muslim
• mutualism
• mysticism
• nahum
• narcissism
• nationalism
• nativism
• naturalism
• nazism
• negativism
• neoplasm
• nepotism
• nestorianism
• nettlesome
• neutralism
• newcomb
• nihilism
• obstructionism
• officialdom
• opossum
• opportunism
• optimism
• optimum
• organism
• orgasm
• ostracism
• ovum
• pablum
• pacifism
• paganism
• parallelism
• parochialism
• paternalism
• patriotism
• pelham
• pendulum
• perfectionism
• pessimism
• phantasm
• phantom
• phylum
• pietism
• pilgrim
• plagiarism
• platinum
• plenum
• pluralism
• polymorphism
• polytheism
• populism
• positivism
• possum
• pragmatism
• prism
• problem
• professionalism
• protectionism
• protestantism
• provincialism
• purim
• puritanism
• quantum
• quarrelsome
• quorum
• racialism
• racism
• radicalism
• random
• ransom
• realism
• recidivism
• rectum
• referendum
• relativism
• republicanism
• revisionism
• rheumatism
• rhythm
• romanticism
• rostrum
• saddam
• sadism
• salem
• sanctum
• sarcasm
• satanism
• schism
• sectarianism
• secularism
• sedum
• seldom
• sensationalism
• separatism
• serum
• sexism
• sheikdom
• skepticism
• slalom
• socialism
• sodom
• solemn
• sorghum
• spasm
• spectrum
• stalinism
• stardom
• steinem
• stigmatism
• stoicism
• stratum
• subkingdom
• subsystem
• supernaturalism
• surrealism
• symbolism
• symptom
• synergism
• system
• talcum
• tandem
• tantalum
• tantrum
• taoism
• tatum
• terrorism
• thatcherism
• theism
• theorem
• threesome
• tiresome
• totalitarianism
• totem
• tourism
• transom
• tristram
• troublesome
• truism
• twosome
• tympanum
• ultimatum
• unilateralism
• unionism
• unwelcome
• vandalism
• vegetarianism
• venom
• venturesome
• verbatim
• victim
• vigilantism
• voyeurism
• wampum
• wearisome
• welcome
• wholesome
• winsome
• wisdom
• worrisome
• yquem
• zionism