The suffix -ish means having the character of. This is shown in the word newish.
The suffix for "furnish" is -ish.
A suffix for white could be "-ness" or "-ish." An example word with the suffix "-ness" would be "whiteness," and an example word with the suffix "-ish" would be "whitish."
The prefix for "abolish" is "a-" and the suffix is "-ish."
Snobbish does not have a prefix. Although, its suffix, is "ish".
-ish, -let.
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The suffix form of "fool" is "-ish," as in "foolish."
"ish" is the suffix. When added to the adjective "blue" (the stem in this case) it indicates approximation. Other common use of this suffix can be turning a noun to an adjective, similarly to the suffix "y": "Freak" (noun) + y = "freaky" (adjective) "Freak" (noun) + ish = "freakish" (adjective)
The suffix for purple is "-ish," so you could say "purplish" to indicate something that resembles or has qualities of purple.
Louddish itself is not a suffix; the -ish is. It means have the character of.