No the word hobby is a noun, you cannot 'hobby' something or someone egHe hobbied the cake.So it is not a verb. There is no verb form for hobby.
Hobby is a noun, i would assume you want to know about the word "programming" as that is a gerund.
I believe it is a gerund, try reading the sentence dropping the word computers: "His hobby is programming" Programming = subject complement of the verb is. At least that is what I got out of this page - http://www.chompchomp.com/terms/gerund.htm
You can find some verb worksheets for my students on amazon, ebay, and other sites like jcpenny, walmart, sears and sack and save and hobby lobby and mardel.
Eat is a verb.
No. Growing is either a verb transitive or a gerund. v. trans: He was growing tomatoes in his backyard. Gerund: Growing plants is a great hobby.
The word "hobby" like a hobby you have, for example "collecting sea glass is my hobby", the word hobby is a noun. Though in the phrase 'hobby horse' it serves as an adjective.
'Spelunk' is the hobby or practice of exploring caves. It can be used as a verb - 'spelunking'. One would use it in a sentence like 'He loves go spelunking'.
hobby = el hobby or el pasatiempo
She collected bugs as a hobby. Her hobby was sewing.
Imagation Is A Hobby
there hobby is to run.