breathe vs breathe out

breathe and breathe out both are verbs.

Word	Noun	Adjective	Verb	Adverb
breathe	No	No	Yes	No
breathe out	No	No	Yes	No

As verbs, breathe out is a hyponym of breathe; that is, breathe out is a word with a more specific, narrower meaning than breathe:

breathe (verb)	breathe out (verb)
draw air into, and expel out of, the lungs	expel air
expel (gases or odors)
reach full flavor by absorbing air and being let to stand after having been uncorked
take a short break from one's activities in order to relax
utter or tell
manifest or evince
impart as if by breathing
be alive
allow the passage of air through