step in vs interact

step in and interact both are verbs.

Word	Noun	Adjective	Verb	Adverb
step in	No	No	Yes	No
interact	No	No	Yes	No

As verbs, interact is a hypernym of step in; that is, interact is a word with a broader meaning than step in:

step in: get involved, so as to alter or hinder an action, or through force or threat of force
interact: act together or towards others or with others

step in (verb)	interact (verb)
get involved, so as to alter or hinder an action, or through force or threat of force	act together or towards others or with others
act as a substitute