gait vs gallop

gait and gallop both are nouns.

Word	Noun	Adjective	Verb	Adverb
gait	Yes	No	No	No
gallop	Yes	No	Yes	No

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

gait: a horse's manner of moving
gallop: a fast gait of a horse; a two-beat stride during which all four legs are off the ground simultaneously

Other hyponyms of gait include walk, rack, single-foot, jog trot, trot, canter, lope.

gait (noun)	gallop (noun)
a person's manner of walking	a fast gait of a horse; a two-beat stride during which all four legs are off the ground simultaneously
a horse's manner of moving
the rate of moving (especially walking or running)