open vs butterfly

open and butterfly both are nouns.

Word	Noun	Adjective	Verb	Adverb
open	Yes	Yes	Yes	No
butterfly	Yes	No	Yes	No

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

Other hyponyms of open include divaricate, exfoliate, grass, uncross, splay.

open (noun)	butterfly (noun)
information that has become public	a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down
a tournament in which both professionals and amateurs may play	diurnal insect typically having a slender body with knobbed antennae and broad colorful wings
a clear or unobstructed space or expanse of land or water
where the air is unconfined

open (adjective)	butterfly (adjective)
ready or willing to receive favorably
affording unobstructed entrance and exit; not shut or closed
affording free passage or access
(set theory) of an interval that contains neither of its endpoints
open and observable; not secret or hidden
used of mouth or eyes
ready for business
not having been filled
(of textures) full of small openings or gaps
openly straightforward and direct without reserve or secretiveness
not requiring union membership
open to or in view of all
possibly accepting or permitting
without undue constriction as from e.g. tenseness or inhibition
having no protecting cover or enclosure
affording free passage or view
with no protection or shield
accessible to all
not sealed or having been unsealed
not brought to a conclusion; subject to further thought
not defended or capable of being defended

open (verb)	butterfly (verb)
make available	talk or behave amorously, without serious intentions
become available	cut and spread open, as in preparation for cooking
make the opening move	flutter like a butterfly
cause to open or to become open
become open
spread out or open from a closed or folded state
display the contents of a file or start an application as on a computer
afford access to
start to operate or function or cause to start operating or functioning
begin or set in action, of meetings, speeches, recitals, etc.
have an opening or passage or outlet