fishnet vs trammel net

fishnet and trammel net both are nouns.

Word	Noun	Adjective	Verb	Adverb
fishnet	Yes	No	No	No
trammel net	Yes	No	No	No

As nouns, trammel net is a hyponym of fishnet; that is, trammel net is a word with a more specific, narrower meaning than fishnet:

fishnet: a net that will enclose fish when it is pulled in
trammel net: a fishing net with three layers; the outer two are coarse mesh and the loose inner layer is fine mesh

Other hyponyms of fishnet include drift net, gill net, landing net, seine, trammel, dragnet, trawl, trawl net.

fishnet (noun)	trammel net (noun)
a net that will enclose fish when it is pulled in	a fishing net with three layers; the outer two are coarse mesh and the loose inner layer is fine mesh