"Hair" and "scared" are really close, but they don't quite make a perfect rhyme because they have different endings. If you did "hair" and "scare" it would work, or even "hairy" and "scary" or "haired" and "scared." That last part has to sound the same as well.
Yes.
Yes, hair does rhyme with square.
They are near rhymes, so yes. If used together, "scared there" it becomes alliteration.
No they do not, that association would be considered a "like rhyme" but not a true rhyme.
Little Miss Muffet was scared by a spider.
Little Miss Muffett
In My Wise Opinion I.E, Not A Very Wise One, No. Sorry
fare
hair, care, lair, mare
Pig wig.
Hair
weird beard