Behavior vs. behaviour is one of plenty words that are spelled differently in American English than in UK English. It's part of a pattern that reaches across the majority of words with the same ending, like flavor/flavour color/colour, labor/labour, and so on. Which spelling is “accurate” depends on where...
Leach vs. leech are easily mixed up words. The spell-check application of most word processing programs won't catch a mix-up of these two words. Spell-check looks for words that aren’t in its dictionary or words that resemble words in its dictionary but are potentially spelled wrong. But it isn’t...
As a noun, gray  is usually in reference to the color. It can also be used as an adjective when we want to say that the color of something is simply a shade of gray. It can be used as a verb  as well, for when something grays (i.e., turns gray, such as hair). But regardless of its...