"tagger" in the noun sense
1. tagger
someone who assigns labels to the grammatical constituents of textual matter
2. tagger
someone who appends or joins one thing to another
"a theory that was simply added on by some anonymous tagger"
3. tagger, tagging program
a computer program that attaches labels to the grammatical constituents of textual matter
Source: WordNet® (An amazing lexical database of English)
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