handline vs fishing line

handline and fishing line both are nouns.

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

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

handline: a fishing line managed principally by hand
fishing line: a length of cord to which the leader and float and sinker and hook are attached

handline (noun)	fishing line (noun)
a fishing line managed principally by hand	a length of cord to which the leader and float and sinker and hook are attached
(climbing) a line that can be hung onto with hands while climbing up or down a steep or slick section for limited protection.