tierce vs canonical hour

tierce and canonical hour both are nouns.

Word	Noun	Adjective	Verb	Adverb
tierce	Yes	No	No	No
canonical hour	Yes	No	No	No

As nouns, canonical hour is a hypernym of tierce; that is, canonical hour is a word with a broader meaning than tierce:

tierce: the third canonical hour; about 9 a.m.
canonical hour: (Roman Catholic Church) one of seven specified times for prayer

tierce (noun)	canonical hour (noun)
one of three equal parts of a divisible whole	(Roman Catholic Church) one of seven specified times for prayer
the cardinal number that is the sum of one and one and one
the third canonical hour; about 9 a.m.