The noun FILTRATION has 2 senses: 1. the process whereby fluids pass through a filter or a filtering medium. 2. the act of changing a fluid by passing it through a filter. Familiarity information: FILTRATION used as a noun is rare.
A sentence averages eleven words; an A4 / letter size sheet averages 32 to 35 sentences. A normal size sheet of paper with a standard layout, based on 80% - 90% coverage contains about 350 to 400 words.
Your 20 pages and the words incorporated in it depends on the size of the page and your font size too. An A4 sized paper will comprise of around 400-450 words ( for an average sized hand writing) If you have a rather tiny font compared to others, then you can juggle in between 500-550.