disassembly vs dismantling

disassembly and dismantling both are nouns.

Word	Noun	Adjective	Verb	Adverb
disassembly	Yes	No	No	No
dismantling	Yes	No	No	No

As nouns, disassembly and dismantling are synonyms defined as:

disassembly and dismantling: the act of taking something apart (as a piece of machinery)

Other synonyms of disassembly include dismantlement.

disassembly (noun)	dismantling (noun)
the act of taking something apart (as a piece of machinery)	the act of taking something apart (as a piece of machinery)