1. Quick learner.
2. Wiki learner
3. Rapid learner.
Adaptable
or smart or quick
A synonym for "very fast" is quick.
quick, speedy, at once
Learner is the correct spelling.
Collective nouns are words to group a like nouns. Collective nouns are not used for the actions of a noun, such a air. Perhaps you were thinking of a synonym (a word that means the same thing) for the term 'air being fast'; a synonym might be 'wind'.
A synonym is a word that shares the same meaning as a different word. Example: Planes are big; Planes are large.
You may be asked in an interview to give an example where you are a fast learner. This is designed to tell a potential employer how you see yourself as picking up new skills.
beginner, learner, recruit, apprentice, nonprofessional, novice
A synonym for "very fast" is quick.
The ability to grasp new concepts quickly = fast learner
Adaptable
Slow and fast are antonyms; a synonym is a word with a similar meaning.
Someone who is a fast learner and catches on to things fast
A learner driver has the same speed restrictions as any other road user.
fast
fast
Agile is a synonym of fast. Athletic is a synonym of fast.
I am a fast learner = I amable to learn new things quickly.