goalkeeper vs participant

goalkeeper and participant both are nouns.

Word	Noun	Adjective	Verb	Adverb
goalkeeper	Yes	No	No	No
participant	Yes	No	No	No

As nouns, participant is a hypernym of goalkeeper; that is, participant is a word with a broader meaning than goalkeeper:

Other hypernyms of goalkeeper include athlete, jock, player.

goalkeeper (noun)	participant (noun)
the defensive position on an ice hockey or soccer or lacrosse team who stands in front of the goal and tries to prevent opposing players from scoring	someone who takes part in an activity
the soccer or hockey player assigned to protect the goal	a person who participates in or is skilled at some game