stow away vs hide out

stow away and hide out both are verbs.

Word	Noun	Adjective	Verb	Adverb
stow away	No	No	Yes	No
hide out	No	No	Yes	No

As verbs, hide out is a hypernym of stow away; that is, hide out is a word with a broader meaning than stow away:

stow away: hide aboard a ship or a plane to get free transportation
hide out: be or go into hiding; keep out of sight, as for protection and safety

Other hypernyms of stow away include hide.

stow away (verb)	hide out (verb)
hide aboard a ship or a plane to get free transportation	be or go into hiding; keep out of sight, as for protection and safety