The word "seeker" means, one who seeks something. In spiritual terms it is related with 'one who is seeking God, or Salvation....' In Hindi खोजी is the word - an adjective - that denotes one who is in search of something.

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Note added at 2 days2 hrs (2008-11-23 18:45:08 GMT)
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What Rawal Saheb said about "SEEKER" is true i.e. जिज्ञासु, अन्वेषक, सत्यान्वेषक. Still, I reiterate that a जिज्ञासु, अन्वेषक, सत्यान्वेषकare in search for someting, hence they are explicitly called खोजी. A जिज्ञासु is curious to learn or find something. Similarly अन्वेषक is engaged in investigating something. Whereas, सत्यान्वेषक is on look out for the 'Truth'. The words - जिज्ञासु, अन्वेषक, सत्यान्वेषक are thus relative to one's endeavour of seeking or finding something. In essence all these three are in search of something, hence they could be called 'Seeker' or खोजी.