outdoor man vs amateur

outdoor man and amateur both are nouns.

Word	Noun	Adjective	Verb	Adverb
outdoor man	Yes	No	No	No
amateur	Yes	Yes	No	No

As nouns, amateur is a hypernym of outdoor man; that is, amateur is a word with a broader meaning than outdoor man:

outdoor man (noun)	amateur (noun)
someone who enjoys outdoor activities	someone who pursues a study or sport as a pastime
	an athlete who does not play for pay

outdoor man (adjective)	amateur (adjective)
	engaged in as a pastime
	lacking professional skill or expertise