Yes, LEATHERWOOD is a Scrabble word!

Letter values in Scrabble US: L 1, E 1, A 1, T 1, H 4, E 1, R 1, W 4, O 1, O 1, D 2.

Is it a valid word?

LEATHERWOOD is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

shrub or small tree of southeastern United States to West Indies and Brazil; grown for the slender racemes of white flowers and orange and crimson foliage
deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers

Also: white titi, cyrilla racemiflora, moose-wood, dirca palustris.

Not playable in Scrabble US: CYRILLA, ROPEBARK.