connection vs cohesion

connection and cohesion both are nouns.

Word	Noun	Adjective	Verb	Adverb
connection	Yes	No	No	No
cohesion	Yes	No	No	No

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

connection (noun)	cohesion (noun)
the act of bringing two things into contact (especially for communication)	(physics) the intermolecular force that holds together the molecules in a solid or liquid
shifting from one form of transportation to another	(botany) the process in some plants of parts growing together that are usually separate (such as petals)
an instrumentality that connects	(linguistics) the grammatical and lexical linking within a text or sentence that holds a text together and gives it meaning.
the process of bringing ideas or events together in memory or imagination	the state of cohering or sticking together
a supplier (especially of narcotics)
(usually plural) a person who is influential and to whom you are connected in some way (as by family or friendship)
a relation between things or events (as in the case of one causing the other or sharing features with it)
a connecting shape
the state of being connected