aid vs help out

aid is a noun but help out is not a noun.

Word	Noun	Adjective	Verb	Adverb
aid	Yes	No	Yes	No
help out	No	No	Yes	No

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

aid (noun)	help out (noun)
the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose
the work of providing treatment for or attending to someone or something
a person or thing that is a resource that helps make something easier or possible to do
gift of money or other material help to support a person or cause

aid (verb)	help out (verb)
improve the condition of	be of help, as in a particular situation of need
give help or assistance; be of service