reconstruction vs mend

reconstruction and mend both are nouns.

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

As nouns, mend is a hypernym of reconstruction; that is, mend is a word with a broader meaning than reconstruction:

Other hypernyms of reconstruction include fix, fixing, fixture, mending, repair, reparation.

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

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