A fill is something different you play to break up the regular drum beat or accent the end of a bar.
I think of a "lick" as the drum equivalent of a "riff" in guitar terminology. Basically any little piece of drum playing, whether it's a fill, part of a groove, repeating pattern, etc.
"Chops" I've always thought of as technical skill. If you say someone has great chops, they have a high level of proficiency when playing drums.
I am not saying these are the "right" answers, but this is how I would define those terms.
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