an adjective is used to modify or describe a noun or pronoun. As an adjective, 'similar' typically refers to something resembling or alike in some respect.
1. The two designs had a strikingly similar aesthetic.
2. They shared some similar qualities, yet had vastly different goals.
3. The painting had a similar composition to that of its predecessor.
when using 'similar' as an adjective, be sure to provide a comparison or explanation of what is similar; simply asserting two things are similar without providing an explanation of how they are similar is not enough to convey the intended meaning. Additionally, when using it to compare two people, be sure to use it in a respectful way, as simply saying two people are 'similar' without any additional context can be seen as offensive or insensitive.