It's not easy to remember the gender of words in French. Is it feminine or masculine?
It doesn't really matter when the other person guesses what you mean from the context.
It is more delicate when the word has 2 possible genres.
And yes, there are words which have a feminine AND a masculine and whose meaning is very different!
To help you, I have created a little ebook and I invite you to download it for free.
When you subscribe to my blog, you'll receive 2 e-book to learn about French periphrasis and strange anglicisms.