Is tithe a word in the Scrabble Dictionary

Yes, tithe is playable

...and is worth 7 points.

Found in the following dictionaries

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

"Tithe" Definition

noun

A tax or assessment of one tenth.
A tenth part.
A very small part.
The institution or obligation of paying tithes.
A tenth part of something paid as a voluntary contribution or as a tax especially for the support of a religious establishment.

verb-transitive

To levy a tithe on.

verb-intransitive

To pay a tithe.

verb

To pay or give a tenth part of especially for the support of the church.
To levy a tithe on.
To give a tenth of one's income as a tithe.