Collocations for similar - adj.

be, feel, look, sound, taste
appear, seem
become
remain

extremely, fairly, very, etc.
remarkably, strikingly
The three portraits are remarkably similar.

basically, broadly, essentially, fundamentally, roughly, vaguely
countries with broadly similar characteristics

superficially
Their experiences are superficially similar.

qualitatively, substantially
surprisingly
eerily, uncannily
The scene in the picture was eerily similar to what I had seen in my dream.

in
The two houses are similar in size.

to
Snake meat tastes similar to chicken.

Similar is used with these nouns:
background, fashion, fate, frequency, kind, pattern, position, predicament, proportion, scenario, size, sort, way