Similar refers to resembling something, but not being identical.
We have many similar interests.
Alike means that two or more things are similar to each other. This word can almost always be used to directly replace similar.
My sister and I are nothing alike.
Indistinguishable means that one cannot tell two or more things apart. In other words when something is indistinguishable one cannot tell the difference between them. It doesn’t mean that they are identical, it just means that someone can’t tell the difference. Indistinguishable is closer to being identical than similar.
Even though these are two different colors my husband thinks they are indistinguishable.
Homogeneous refers to two or more things that are alike. Homogeneous is often used to say that two things go together.
Not all doctors think in a homogeneous way.
Comparable refers to something being likened to something else. It’s a way of saying that one thing is similar to another.
I don’t feel like those two things are comparable.
Equivalent refers to having the same amount or value.
These two things cost the same thing, but the quality isn’t equivalent.
Akin refers to two or more things being similar in character.
The pain that I felt in my knee today was not akin to what I felt before.
Related means that two or more things are part of the same group or they are connected. This word is often used to describe family members, but it is even more commonly used to describe anything that is similar or is connected to another thing.
Is the research that you did related to what I was doing earlier?
Close refers to being near something, or being near in proximity to doing something. Two things can be close in location or similar in nature.
These two colors are very close to each other.
Resembling means that the qualities and appearance of one thing is similar to that of another. This word is especially used when speaking about things that look similar.
The two documents resemble each other, but if you look closely you can see the differences between them.
Correlative means that there is a mutual relationship between two or more things.
Parents and teachers have correlative goals when it comes to their children’s education.