save vs keep open

save is a noun but keep open is not a noun.

Word	Noun	Adjective	Verb	Adverb
save	Yes	No	Yes	No
keep open	No	No	Yes	No

As verbs, save and keep open are synonyms defined as:

Other synonyms of save include hold open, keep.

save (noun)	keep open (noun)
(sports) the act of preventing the opposition from scoring

save (verb)	keep open (verb)
make unnecessary an expenditure or effort	retain rights to
record data on a computer
to keep up and reserve for personal or special use
accumulate money for future use
spend less; buy at a reduced price
retain rights to
spend sparingly, avoid the waste of
bring into safety
save from ruin, destruction, or harm
save from sins
refrain from harming