Which word has a suffix that makes it an adjective? a. grace b. glorious c. adventure d. fame

A postfix is a letter or gathering of letters included toward the finish of a word which makes another word.  

Regularly, the addition causes a spelling change to the first word. In the table over, the - e closure of confuse and make vanishes when the - particle addition is included. 

Different cases of spelling changes include: 

excellence, obligation + - ful → excellent, loyal (- y changes to I) 

substantial, prepared + - ness → weight, preparation (- y changes to I) 

capable, conceivable + - ity → capacity, probability (- le changes to il) 

allow, discard + - particle → authorization, exclusion (- t changes to ss) 

A decent student's lexicon will give you data on the right spelling of words with postfixes