The word "rho" uses 3 letters: hor.

RHO is playable in:

Words With Friends5
Scrabble US6
Scrabble UK6

rho is a valid word in this word list. For a definition, see the external dictionary links below.

Try a search for rho in these online resources (some words may not be found):
Wiktionary - OneLook Dictionaries - Merriam-Webster - Google Search
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Words formed by adding one letter before or after rho (in bold), or to hor in any order:

e - hero6 hoer6

a - hoar6 hora6

n - horn7

u - hour7

s - rhos6

t - thro6

Shorter words found within hor

List all words that start with Q, adjectives that start with Q or find all 5 letter words starting with Q

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Words with all letters different - Letter pairs and double letters - Hook Word Lists