pronouns - passive Vs active or omission of 'which is'


What is the part of speech of 'regarded' in the following?



"a quality of beauty and intensity of emotion regarded as characteristic of poems" (NOAD)



Why isn't it "... [which is] regarded ..."?


And in another case:



"a small lizard with wide feet, found especially in warm countries" (CALD)



And also:



"Words used to describe writing or speech style" (Macmillan)



In all these examples, why shouldn't the verbs be in their passive form (e.g. which is found, words that are used)?


I am a ESL learner and I am very confused by these usages!




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