tierce vs trio

tierce and trio both are nouns.

Word	Noun	Adjective	Verb	Adverb
tierce	Yes	No	No	No
trio	Yes	No	No	No

As nouns, tierce and trio are synonyms defined as:

tierce and trio: the cardinal number that is the sum of one and one and one

tierce (noun)	trio (noun)
one of three equal parts of a divisible whole	a musical composition for three performers
the cardinal number that is the sum of one and one and one	three people considered as a unit
the third canonical hour; about 9 a.m.	a set of three similar things considered as a unit
	three performers or singers who perform together
	the cardinal number that is the sum of one and one and one