starting stall vs starting gate

starting stall and starting gate both are nouns.

Word	Noun	Adjective	Verb	Adverb
starting stall	Yes	No	No	No
starting gate	Yes	No	No	No

As nouns, starting stall and starting gate are synonyms defined as:

starting stall and starting gate: a movable barrier on the starting line of a race course

starting stall (noun)	starting gate (noun)
a movable barrier on the starting line of a race course	a movable barrier on the starting line of a race course