attachment vs ligature

attachment and ligature both are nouns.

Word	Noun	Adjective	Verb	Adverb
attachment	Yes	No	No	No
ligature	Yes	No	No	No

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

Other hyponyms of attachment include bonding, soldering, doweling, earthing, grounding, linkage, tying, welding, fixation.

attachment (noun)	ligature (noun)
the act of fastening things together	the act of tying or binding things together
the act of attaching or affixing something	something used to tie or bind
faithful support for a cause or political party or religion	thread used by surgeons to bind a vessel (as to constrict the flow of blood)
a supplementary part or accessory	a metal band used to attach a reed to the mouthpiece of a clarinet or saxophone
a connection that fastens things together	(music) a group of notes connected by a slur
a writ authorizing the seizure of property that may be needed for the payment of a judgment in a judicial proceeding	character consisting of two or more letters combined into one
a feeling of affection for a person or an institution