The word "impresser" refers to a person or thing that impresses, but its spelling can be a little tricky. The first syllable is pronounced "im" with a short "i" sound like in "twin." The second syllable is pronounced "pres" with a long "e" sound like in "meet," and the stress falls on this syllable. The final syllable is pronounced "er" with a short "e" sound like in "pet." When spelled correctly, the word has two "s"s and one "e."