This is the 904th most frequent Spanish word.
similar
Having a resemblance or likeness; almost the same.
Here, 'similar' is used as an adjective expressing similarity in appearance or attributes between two items.
Esta pintura es similar a la que vimos en el museo.
This painting is similar to the one we saw in the museum.
In this context, 'similares' agrees in number with 'opiniones' and indicates likeness in views or ideas.
Ellas tienen opiniones similares sobre el problema.
They have similar opinions about the problem.
The word 'similar' describes a potential product that shares characteristics with another.