disassembly vs dismantlement

disassembly and dismantlement both are nouns.

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

As nouns, disassembly and dismantlement are synonyms defined as:

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

Other synonyms of disassembly include dismantling.

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