The Noun "fast" has 1 synset
1. abstaining from food
The Verb "fast" has 2 synsets
1. abstain from certain foods, as for religious or medical reasons
2. abstain from eating
The Adjective "fast" has 3 synsets
1. acting or moving or capable of acting or moving quickly
2. (used of timepieces) indicating a time ahead of or later than the correct time
3. at a rapid tempo
The Adverb "fast" has 2 synsets
1. quickly or rapidly (often used as a combining form)
2. firmly or closely