Words about words

You do something solo if you do it by yourself, alone. The person in the picture is giving a solo performance.

You solve a puzzle or a problem when you work out an answer or solution. For example, you solve a jigsaw puzzle when you put all the pieces together to make a picture, and you solve a Rubik's cube when you have each face of the cube a single color.

Sonic means relating to sound.

extension To sort means to put things into groups or arrange them in a certain way. You can sort objects by their color, size, shape, or type. You might sort blocks by color, or books by title.

The person in the picture is sorting pearls.

You can sort the dolls above by size.

Spanish is the language spoken in Spain, someone from Spain, or describes anything to do with Spain.

Something is described as sparse if the things on it or in it are spread quite far apart from each other. The picture is of a sparse forest, with big spaces between the trees.
The opposite of sparse is dense or thick.

Sped is the past tense of speed, for example "she sped past him on her motorbike".

A meal is spicy if it has strong, hot flavors, often making your mouth feel warm or a little burning.

Spicy food, like chili peppers or hot sauces, can taste sharp and can make you sweat. Many people use spices to season soups, noodles, tacos, and curries.

Spilled, also spelled spilt, is the past tense of spill.

A splash happens when something hits water fast. You make a big splash if you jump into a swimming pool. The splash in the picture is from someone throwing stones into a pond.