And in addition to shona's suggestions of "propoer" words, we use a variety of slang to plug the gap.
gen is information about a psecific (I mean specific, but that looks too good to erase!) area of activity as is info.
THE knowledge is the detailed topographical knowledge of the taxi driver
wrinkle is knowledge that has been acquired by experience of a quicker/easier way of doing something.

I am sure there are others.