As nouns the difference between couches and coaches
is that couches is plural of lang=en while coaches is plural of lang=en.
As verbs the difference between couches and coaches
is that couches is third-person singular of couch while coaches is third-person singular of coach.
couches
English
Noun
(head)
Verb
(head)
(couch)
----
coaches
English
Noun
(head)
Verb
(head)
(coach)
----