trotline vs fishing line

trotline and fishing line both are nouns.

Word	Noun	Adjective	Verb	Adverb
trotline	Yes	No	No	No
fishing line	Yes	No	No	No

As nouns, fishing line is a hypernym of trotline; that is, fishing line is a word with a broader meaning than trotline:

trotline: a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys)
fishing line: a length of cord to which the leader and float and sinker and hook are attached

trotline (noun)	fishing line (noun)
a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys)	a length of cord to which the leader and float and sinker and hook are attached