tagging program vs tagger

tagging program and tagger both are nouns.

Word	Noun	Adjective	Verb	Adverb
tagging program	Yes	No	No	No
tagger	Yes	No	No	No

As nouns, tagging program and tagger are synonyms defined as:

tagging program and tagger: a computer program that attaches labels to the grammatical constituents of textual matter

tagging program (noun)	tagger (noun)
a computer program that attaches labels to the grammatical constituents of textual matter	a computer program that attaches labels to the grammatical constituents of textual matter
	someone who appends or joins one thing to another
	someone who assigns labels to the grammatical constituents of textual matter