1. Orange would normally take a feminine rhyme, so you need two syllables to rhyme.

2. Door hinge has a different vowel in the first syllable, plus the "h", so doesn't rhyme perfectly.

1. OK - see 2.

2. I pronounce or and door with exactly the same vowel, but you've got me on the 'h', unless, of course, the h is dropped as in some dialects.

Now, with regard to purple, may I submit 'burple', "the color of a belch".

Also, for those who remember the old 'Laugh-In" TV show, there was Fred Farkle's next-door neighbor, Ferd Ferple.