tabu vs taboo

tabu and taboo both are nouns.

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

As adjectives, tabu and taboo are synonyms defined as:

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

As adjectives, tabu and taboo are synonyms defined as:

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

As nouns, tabu and taboo are synonyms defined as:

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

As nouns, tabu and taboo are synonyms defined as:

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

tabu (noun)	taboo (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

tabu (adjective)	taboo (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

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