Care
You could add the suffix -s to it to make the word isles.
falsehood
fragrance
It can be, if you add a suffix or prefix. For example, in the word 'going', 'go' is the base word, and '-ing' is the suffix.
You can add the suffix -ful to meaning: that makes the word "meaninful"-- filled with meaning, something worth remembering. You can also add the suffix -less: that makes "meaningless"-- something that has no meaning or isn't worth worrying about.
To add a suffix to "habitat," you would simply attach the suffix to the end of the word. For example, adding the suffix "-ion" would create the word "habitation."
a
One suffix you can add is -en. In this case, the word would be seen.
To add the suffix '-ness' to 'immaterial', you would remove the last 'i' and add 'ness'. The word would become 'immaterialness'.
-ize
You would add the suffix -less meaning without or lacking, to make "senseless."
The suffix that you would add to the root word truth in order to create a word that means by honesty is ful.
You can add the suffix "ment" to form the word "involvement."
You could add the suffix -ed to it to make the word hunted.
Legalizing
Sure, if you add the suffix "-ly" to the word "significant," it becomes "significantly."
A common type of suffix that could be added to the word "replace" is "-ment," to form the word "replacement".