How to spell harass
harass
Not harrass.
The trap
The word harass has one R and two Ss, and harrass doubles the wrong letter. The pair is at the end, however much the word looks like it should match embarrass, which doubles both.
Not every consonant doubles. A double is there for a reason: often an added ending, sometimes the word's history. Where neither applies, the letter stays single.
What it means
verb. to subject to aggressive pressure or intimidation
Other words with this trap
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Play today's Daily FiveSpellingIQ is a skill rating for spelling ability, not a clinical or psychometric IQ measure. American English is canonical; common variants are accepted.