metre vs common measure

metre and common measure both are nouns.

Word	Noun	Adjective	Verb	Adverb
metre	Yes	No	No	No
common measure	Yes	No	No	No

As nouns, common measure is a hyponym of metre; that is, common measure is a word with a more specific, narrower meaning than metre:

Other hyponyms of metre include catalexis, scansion, common meter, foot, metrical foot, metrical unit.

metre (noun)	common measure (noun)
rhythm as given by division into parts of equal duration	the usual (iambic) meter of a ballad
(prosody) the accent in a metrical foot of verse	an integer that divides two (or more) other integers evenly
the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)	a time signature indicating four beats to the bar