taboo vs tabu

taboo and tabu both are nouns.

Word	Noun	Adjective	Verb	Adverb
taboo	Yes	Yes	Yes	No
tabu	Yes	Yes	No	No

As adjectives, taboo and tabu are synonyms defined as:

Other synonyms of taboo include forbidden, out, prohibited, proscribed, verboten.

As adjectives, taboo and tabu are synonyms defined as:

taboo and tabu: forbidden to profane use especially in South Pacific islands

As nouns, taboo and tabu are synonyms defined as:

taboo and tabu: an inhibition or ban resulting from social custom or emotional aversion

As nouns, taboo and tabu are synonyms defined as:

taboo and tabu: a prejudice (especially in Polynesia and other South Pacific islands) that prohibits the use or mention of something because of its sacred nature

taboo (noun)	tabu (noun)
an inhibition or ban resulting from social custom or emotional aversion	an inhibition or ban resulting from social custom or emotional aversion
a prejudice (especially in Polynesia and other South Pacific islands) that prohibits the use or mention of something because of its sacred nature	a prejudice (especially in Polynesia and other South Pacific islands) that prohibits the use or mention of something because of its sacred nature

taboo (adjective)	tabu (adjective)
excluded from use or mention	excluded from use or mention
forbidden to profane use especially in South Pacific islands	forbidden to profane use especially in South Pacific islands

taboo (verb)	tabu (verb)
declare as sacred and forbidden