Two words that I can never, ever remember when I'm looking at the objects in question. We had a tamarack tree in our back yard for years and no matter how many times I'd see it, I'd go blank if I tried to use it in a sentence. I'd call it 'the bird tree' for the sparrows that liked to ride it in the wind.
( The strange case of the hole in Walter Bishop's memory, or why he never called her Astrid )
Interestingly enough, when I see a bottle of turmeric in somebody else's kitchen, I never forget what it's called. Brains are strange that way, eh?