verse vs octameter

verse and octameter both are nouns.

Word	Noun	Adjective	Verb	Adverb
verse	Yes	No	Yes	No
octameter	Yes	No	No	No

As nouns, octameter is a hyponym of verse; that is, octameter is a word with a more specific, narrower meaning than verse:

verse (noun)	octameter (noun)
a piece of poetry	a verse line having eight metrical feet
a line of metrical text
literature in metrical form

verse (verb)	octameter (verb)
familiarize through thorough study or experience
compose verses or put into verse