Good thread.
Sharing a small office for almost 20yrs with a fluent (and fanatical) Gaelic speaker was often a trial
....but by a process of unconscious osmosis I picked up a few key words and phrases too. The colours - dearg, liath, ghlas etc - are an obvious one.
But also the shapes and contours of hills can be very descriptive and informative and can really help to enhance your understanding of the landscape - not to mention making map reading a wee bit more interesting.
So, words like Sgurr , Stuc, Stob etc. all describe the landscape really well.
Its worth investing a little time to learn more about this. The rewards stay with us for years.