Nouns ending in L-O-N-E-R-S = masc
Nouns ending in D-ION-Z-A = fem (thinks loners and diosas ;D )
Irregulars:
LA tarde, LA noche, LA suerte (remember Lady Luck...), LA gente, LA muerte (difficult since I think most envision Death as masc...)
More fem irregs: LA mano, LA crisis, LA tesis...
Masc irreg: Un camion (I screw this one up ALL the time -- and is camioneta fem or masc?), EL mapa, EL dia, EL lapiz, EL avion.
Letters of the alphabet are all feminine (la letra E etc)
If a word begins with a stressed A then it takes a masc ie el aguila, el hambre, or you would say un ama de casa because the A - A would run into each other. But then if you're talking about the best housewife you would say la mejor ama de casa (I think... since it's referring to a female)
Then it gets weird because that eagle that was masc in the singular, when it's suddenly a whole bunch of eagles it becomes fem! El aguila... LAS aguilas.
Then those -MA words -- apparently you need to know your Greek to be able to speak Spanish... yikes! If they're greek they are MASC. So LA cama because it's not greek but EL telegrama because it is. Where I get tripped up is words like TRAMA -- sounds greek to me, but apparently no it's not, so it's a la. Same with BROMA and ASMA to me sounds like, hmm maybe greek, I don't know? But no, they aren't so they are both FEM
Then there's the lovely case of AZUCAR. Not content to be either FEM or MASC azucar is both. El azucar... but if you're describing the sugar to be brown or white it's suddenly feminine accordance ie azucar morena, azucar blanca. If anyone has a nice clean explanation that would be great.
Speaking of which, can someone explain EL bolso vs LA bolsa -- and I'm not talking about the stock market. El bolso = bag. La bolsa = bag -- is la bolsa really just more referring to a woman's handbag or what? I never know if I'm supposed to say el or la, and don't know if it makes any difference whether I'm using a plastic bag, a paper bag, a handbag (which I get around by saying cartera, jaja), reusable bag etc. Would love to know....