What part of speech is the word look in tbis sentence One them taped up and his feet smaller than mine?

The word "look" is not present in the sentence "One of them taped up and his feet smaller than mine."

The sentence is incomplete and likely missing context. To determine the part of speech of "look," we need the full sentence.

For example, if the sentence were "One of them looked up and his feet were smaller than mine," then "looked" would be a verb.