Me imagino, this is coming form someone who is living in Mexico and learning. Hope this helps!
The answer would be "lavar" which means wash
"Voy a lavar la ropa porque está sucia"
"I will wash the clothes because they are dirty"
To make a word in Spanish plural, it's quite similar to English where you will add s, es, etc to the end to indicate there are multiple of something.
10 words for examples as requested: plumas, libros, camisetas, escritorios, lápices (plural of lápiz), manos, pollos, sombreros, camisas, pantallas.
If you want to say the (word), add el/la depending on the word's gender.
<span>Antoni Gaudí (an architect) designed La Sagrada Familia.</span>
