interject vs throw in

interject and throw in both are verbs.

Word	Noun	Adjective	Verb	Adverb
interject	No	No	Yes	No
throw in	No	No	Yes	No

As verbs, interject and throw in are synonyms defined as:

Other synonyms of interject include come in, inject, interpose, put in.

interject (verb)	throw in (verb)
to insert between other elements	to insert between other elements
	give up in the face of defeat of lacking hope; admit defeat
	add as an extra or as a gratuity