Finding Bigrams in a list of worrds

How would I go about finding a bigram in a list? For example, if I wanted to find the

bigram = list(nltk.bigrams("New York"))

In a list of words,

words = nltk.corpus.brown.words(fileids=["ca44"])

I have tried doing,

for t in bigram:
        if t in words:
             *do something*

As well as,

if bigram in words:
   *do something*