What part of speech is bobsled?

Bobsled can be categorized as a noun and a verb.

Parts of speech

1. bobsled is a verb, present, 1st person singular of bobsled (infinitive).
2. bobsled is a verb (infinitive).
3. bobsled is a noun, singular of bobsleds.

Verb
bobsled - ride a bobsled; "The boys bobbed down the hill screaming with pleasure"
Noun
bobsled - a long racing sled (for 2 or more people) with a steering mechanism
bobsled - formerly two short sleds coupled together