connexion vs attachment

connexion and attachment both are nouns.

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

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

connexion: the act of bringing two things into contact (especially for communication)
attachment: the act of fastening things together

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

connexion (noun)	attachment (noun)
the act of bringing two things into contact (especially for communication)	the act of fastening things together
shifting from one form of transportation to another	the act of attaching or affixing something
an instrumentality that connects	faithful support for a cause or political party or religion
the process of bringing ideas or events together in memory or imagination	a supplementary part or accessory
a relation between things or events (as in the case of one causing the other or sharing features with it)	a connection that fastens things together
a connecting shape	a writ authorizing the seizure of property that may be needed for the payment of a judgment in a judicial proceeding
	a feeling of affection for a person or an institution