Yes, have is playable
...and is worth 10 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Have" Definition
noun
A person who possesses great material wealth.
One that is well-endowed especially in material wealth.
auxiliary-verb
Used with a past participle to form the present perfect, past perfect, and future perfect tenses indicating completed action: The troublemaker has gone for good. I regretted that I had lost my temper. They will have finished by the time we arrive.
verb
To be related in some way to (with the object identifying the relationship).
To partake of a particular substance (especially a food or drink) or action.
Used in forming the perfect aspect and the past perfect aspect.
To hold, own, or possess as an appurtenance, property, attribute, or quality; hold in possession: as, to have and to hold.
To hold by accepting, receiving, obtaining, gaining, or acquiring in any way; become possessed of or endowed with; be in receipt of; get: as, he has high wages; they have had ten children.
To contain or comprise as an adjunct or component part: as, the work has an index; his wit has a spice of malice.
To hold for use or disposal, actually or potentially; hold the control over or right to: as, to have the floor (in debate); to have the deal (in card-playing); to have authority.
To hold in exercise or consideration; entertain; maintain: as, to have a wish, opinion, or objection; to have a discussion.
idiom
Better Usage Problem To be wise or obliged to; should or must: He had better do what he is told. You had best bring a raincoat in this weather.
Have (something) coming To deserve what one receives: You had that reprimand coming for a very long time.
Have done with To stop; cease: Have done with your quibbling!.
Have had it Informal To be in a state beyond remedy, repair, or salvage: That coat has had it.
Have had it Informal To have done everything that is possible or that will be permitted.