I need to find whether a word is verb or noun or it is both
For example, the word is \"search\" it can be both noun and a verb but stanford parser gives NN tag to i
The Stanford Parser guesses the part-of-speech tag of a word based on context statistics. You should really pass in a complete sentence to determine whether, in that sentence, "search" is a noun or a verb.
You don't need a full parser just to get part-of-speech tags. The Stanford POS Tagger is enough; it also includes the Morphology
class, but it too takes context into account.
If you want all part-of-speech tags that an English word can take on, without giving context, then WordNet is probably a better choice. It has several Java interfaces, including JWNL and JWI.