Scrabble Dictionary

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Yes, guest is playable

...and is worth 8 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Guest" Definition

noun

A distinguished visitor to whom the hospitality of an institution, city, or government is extended.
A visiting performer, speaker, or contestant, as on a radio or television program.
One to whom entertainment or hospitality has been extended by another in the role of host or hostess, as at a party.
One who is a recipient of hospitality at the home or table of another.
One who pays for meals or accommodations at a restaurant, hotel, or other establishment; a patron.

adjective

Participating as a guest: a guest conductor.
Provided for guests: guest rooms.

verb-intransitive

To appear as a guest: guested on a television series.

verb-transitive

To entertain as a guest.

verb

To receive as a guest.
To appear as a guest.