rough / ruff are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
rough: (noun) the part of a golf course bordering the fairway where the grass is not cut short. (adjective) having or caused by an irregular surface. (adjective) (of persons or behavior) lacking refinement or finesse. (adjective) of the margin of a leaf shape; having the edge cut or fringed or scalloped. (adjective) causing or characterized by jolts and irregular movements. (adjective) not perfected.
ruff: (noun) common Eurasian sandpiper; the male has an erectile neck ruff in breeding season. (noun) (card games) the act of taking a trick with a trump when unable to follow suit.
rough: r·AH·f
ruff: r·AH·f
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)