mend vs troubleshoot

mend is a noun but troubleshoot is not a noun.

Word	Noun	Adjective	Verb	Adverb
mend	Yes	No	Yes	No
troubleshoot	No	No	Yes	No

As verbs, troubleshoot is a hyponym of mend; that is, troubleshoot is a word with a more specific, narrower meaning than mend:

mend: restore by replacing a part or putting together what is torn or broken
troubleshoot: solve problems

mend (noun)	troubleshoot (noun)
the act of putting something in working order again
sewing that repairs a worn or torn hole (especially in a garment)

mend (verb)	troubleshoot (verb)
restore by replacing a part or putting together what is torn or broken	solve problems
heal or recover