amateur vs dabbler

amateur and dabbler both are nouns.

Word	Noun	Adjective	Verb	Adverb
amateur	Yes	Yes	No	No
dabbler	Yes	No	No	No

As nouns, dabbler is a hyponym of amateur; that is, dabbler is a word with a more specific, narrower meaning than amateur:

amateur: someone who pursues a study or sport as a pastime
dabbler: an amateur who engages in an activity without serious intentions and who pretends to have knowledge

Other hyponyms of amateur include bird watcher, birder, dilettante, sciolist, hobbyist.

amateur (noun)	dabbler (noun)
someone who pursues a study or sport as a pastime	any of numerous shallow-water ducks that feed by upending and dabbling
an athlete who does not play for pay	an amateur who engages in an activity without serious intentions and who pretends to have knowledge

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