Things that are very much alike or almost the same.
When things are simulars, it can be helpful for understanding or finding things.
Examples:
The two cars are simulars, they look almost the same.
My drawing and yours are simulars, they both have a tree and a house.
The two dogs are simulars, they both have long tails.
The two cakes are simulars, they both taste very sweet.
The two stories are simulars, they both have a happy ending.
The two toys are simulars, they both make noise when you shake them.