athletic supporter vs jockstrap

athletic supporter and jockstrap both are nouns.

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

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

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

Other synonyms of athletic supporter include jock, supporter, suspensor.

athletic supporter (noun)	jockstrap (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