jock vs athletic supporter

jock and athletic supporter both are nouns.

Word	Noun	Adjective	Verb	Adverb
jock	Yes	No	No	No
athletic supporter	Yes	No	No	No

As nouns, jock and athletic supporter are synonyms defined as:

jock and athletic supporter: a support for the genitals worn by men engaging in strenuous exercise

Other synonyms of jock include jockstrap, supporter, suspensor.

jock (noun)	athletic supporter (noun)
a support for the genitals worn by men engaging in strenuous exercise	a support for the genitals worn by men engaging in strenuous exercise
a person trained to compete in sports