WordNet sense 1 (a written document describing the findings of some individual or group):

report, report, written report

WordNet sense 2 (a branch of knowledge):

bailiwick, discipline, field, subject, subject, branch of knowledge, field of study, subject area, subject field

WordNet sense 3 (attentive consideration and meditation):

cogitation

WordNet sense 4 (applying the mind to learning and understanding a subject (especially by reading)):

work

WordNet sense 5 (preliminary drawing for later elaboration):

sketch

WordNet sense 6 (give careful consideration to):

consider

WordNet sense 7 (think intently and at length, as for spiritual purposes):

contemplate, meditate

WordNet sense 8 (a detailed critical inspection):

survey, survey

WordNet sense 9 (consider in detail and subject to an analysis in order to discover essential features or meaning):

analyze, canvas, canvass, examine, analyse

WordNet sense 10 (learn by reading books):

hit the books

WordNet sense 11 (be a student of a certain subject):

learn, read, take, read