Practice and Review
The Spanish words for the colors black, blue, green, red, and yellow are not hard too difficult to remember. The Spanish word for black is Negro. Negro is pronounced "nay-grow" as oppossed to "nee-grow" in American slang. While the American slang word is unfortunate, you can take advantage of it to help you remember the Spanish word for black. Just be sure to prounounce the Spanish word for the color black correctly to avoid insulting anyone.

The Spanish word for blue is azul (pronounced "asool". While the word azul doesn't look or sound anything like the word blue, azul is four letters long like the word blue so you can use that, at least, to help you remember that azule is the Spanish word for blue.

The Spanish word for green is verde (prounouced with an almost silent b sound--bear-day). Many words that start with v in Spanish have a near silent b sound. Verde is easily remembered by anyone familiar with Tex-Mex food and the popular green spicy sauce called Verde sauce.

The Spanish word for red is rojo (prounouced row-ho--where the r rolls slightly). Rojo and red may not sound the same, but they are both short words and they both start with the letter r which should help you to remember that Rojo is the Spanish word for red.

The Spanish word for yellow is amarillo (prounouced am-a-ridyo--where the dy are sort of rolled on the tongue slightly). Amarillo is the name of a town in Texas, so if you're familiar with Amarillo, it's not hard to remember amarillo is the Spanish word for yellow.