foot vs iambic trimeter

foot and iambic trimeter both are nouns.

Word	Noun	Adjective	Verb	Adverb
foot	Yes	No	Yes	No
iambic trimeter	Yes	No	No	No

As nouns, iambic trimeter is a hyponym of foot; that is, iambic trimeter is a word with a more specific, narrower meaning than foot:

foot: (prosody) a group of 2 or 3 syllables forming the basic unit of poetic rhythm
iambic trimeter: a meter of poetry consisting of three iambic units per line.

Other hyponyms of foot include dactyl, iamb, iambus, anapaest, anapest, amphibrach, trochee, spondee, dibrach, pyrrhic.

foot (noun)	iambic trimeter (noun)
travel by walking	a meter of poetry consisting of three iambic units per line.
any of various organs of locomotion or attachment in invertebrates
the pedal extremity of vertebrates other than human beings
lowest support of a structure
a support resembling a pedal extremity
the part of the leg of a human being below the ankle joint
(prosody) a group of 2 or 3 syllables forming the basic unit of poetic rhythm
an army unit consisting of soldiers who fight on foot
the lower part of anything
a member of a surveillance team who works on foot or rides as a passenger
a linear unit of length equal to 12 inches or a third of a yard