Synonyms for Athletic supporter:

n.

jersey, shin pad, kit, cup, shin guard, box, leotard. artifact (noun)
jockstrap, jock, suspensor.
athletic supporter (noun)
jockstrap, jock, suspensor.
support for genitals (noun)
jock, cup, jockstrap.

Other synonyms:

shin guard, leotard, shin pad. cup, jersey. kit. box. Other relevant words:
cup.