Metaphors Are Like Similes, but Metaphors Are Not Similes

[MineralMan]

4. The word rectangle includes that information.

Rect =Right
Angle = Angle

RectAngle.

Square, as you use it in your sentence, is an adjective, not a noun. It can be used as both parts of speech. Had you used it as a noun in that sentence, it would have read: "All rectangles are squares." The plural form is required.

The English language is full of potential confusion. When a word can be used as multiple parts of speech the chances of confusion are increased. Add multiple definitions of individual words, along with homophones (right, write) and it gets even more complicated in spoken English.

That's why we need English majors like me.