STUMPERS CCCV

From Reader's Digest
Contributed by Marvin W. Lilie

The last three syllable of a four-syllable word sound exactly like a word of three syllables. The three-syllable word and its sound-alike as it appears in the four-syllable word differ in spelling by only a single letter. The three-syllable word means small and modest, while the four-syllable word means gigantic, extraordinary, or hard to believe. What are the two words?

HINT:
The three-syllable word is often associated with the word FEE.

Answers:

NOMINAL
PHENOMENAL