impetigo
A chattering bird with six letters
Their song with six letters from 1982 was called Elvira.
It is a cornet.
engine
The middle of a word with six letters is often referred to as the "third" and "fourth" letters, since they occupy the center positions. In a six-letter word, the middle letters can be considered the heart or center of the word. If you're looking for a specific term, "center" is a fitting descriptor, but it is not six letters long.
Cellar
"P alphabet" and "having six words" don't make sense. The letters of the alphabet are called letters, not alphabets, and how can a name of a vegetable have six words?
A keyboard - named from the first six letters on top row
It is called that because the first six letters on a standard keyboard are the letters Q, W, E, R, T, and Y.
The name QWERTY comes from the six letters at the left of the top row of letters on that keyboard (Q, W, E, R, T, and Y). Hence, QWERTY should actually be all in capitals, despite what many people think.
An Italian pasta with six letters is rotini.
Both Canada and Mexico have six letters.