What words describe something that is liquid?

liquid (adj), molten

What words describe a liquid that is almost solid?

thick, stiff, creamy, smooth, lumpy, viscid, viscous, paste, concentrated

What words refer to becoming thicker?

thicken, get thicker, set, congeal, clot

What words describe a liquid that is very fluid?

fluid, watery, thin, runny, diluted

What words refer to the top of a liquid?

surface

What words refer to removing the thick part on top?

skim

What words refer to bubbles in or on a liquid?

bubble (n), bubble (v), bubbly, suds, foam