A superlative adjective is an adjective we use to compare three or more things to pick out one thing that is more ''something" than the others.
eg adjective tall - Martin is the tallest in the class.
For longer adjectives (more than one syllable) we use most.
eg adjective famous - Martin is the most famous in our family.
There is no specific definition for the word "superlarative." It appears to be a misspelling or a combination of "superlative" and "comparative." The term "superlative" is an adjective used to describe something as the highest degree or quality of its kind.