pos tagger vs part-of-speech tagger

pos tagger and part-of-speech tagger both are nouns.

Word	Noun	Adjective	Verb	Adverb
pos tagger	Yes	No	No	No
part-of-speech tagger	Yes	No	No	No

As nouns, pos tagger and part-of-speech tagger are synonyms defined as:

pos tagger and part-of-speech tagger: a tagging program whose labels indicate a word's part of speech

pos tagger (noun)	part-of-speech tagger (noun)
a tagging program whose labels indicate a word's part of speech	a tagging program whose labels indicate a word's part of speech