tierce vs triplet

tierce and triplet both are nouns.

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

As nouns, tierce and triplet are synonyms defined as:

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

Other synonyms of tierce include 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, trey, triad, trine, trinity, trio, troika.

tierce (noun)	triplet (noun)
one of three equal parts of a divisible whole	a set of three similar things considered as a unit
the cardinal number that is the sum of one and one and one	one of three offspring born at the same time from the same pregnancy
the third canonical hour; about 9 a.m.	the cardinal number that is the sum of one and one and one