mend vs reconstruction

mend and reconstruction both are nouns.

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

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

mend (noun)	reconstruction (noun)
the act of putting something in working order again	the activity of constructing something again
sewing that repairs a worn or torn hole (especially in a garment)	recall that is hypothesized to work by storing abstract features which are then used to construct the memory during recall
	an interpretation formed by piecing together bits of evidence

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