gait vs waddle

gait and waddle both are nouns.

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

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

gait: a person's manner of walking
waddle: walking with short steps and the weight tilting from one foot to the other

gait (noun)	waddle (noun)
a person's manner of walking	walking with short steps and the weight tilting from one foot to the other
a horse's manner of moving
the rate of moving (especially walking or running)

gait (verb)	waddle (verb)
	walk unsteadily, with short steps