Senior is used after these nouns:
college, high school

be

very
a meeting of all the very senior officers

fairly, quite, relatively
enough
She wasn't senior enough to take such a decision.

to
Is Mark senior to you?

Senior is used with these nouns:
adviser, aide, analyst, appointment, architect, assistant, athletics, attorney, author, barrister, biologist, bureaucrat, citizen, clerk, colleague, commander, consultant, correspondent, counsel, designer, diplomat, director, division, doctor, economist, editor, employee, envoy, executive, faculty, fellow, figure, football, grade, high school, hockey, instructor, judge, lawyer, leader, leadership, lecturer, level, librarian, magistrate, management, manager, member, minister, moment, negotiator, nurse, officer, official, partner, pastor, personnel, physician, policeman, politician, position, post, producer, professional, professor, programmer, psychiatrist, pupil, rank, reporter, representative, researcher, rugby, scholar, school, scientist, season, seminar, senator, soccer, social worker, staff, statesman, steward, supervisor, surgeon, teacher, team, technician, thesis, tour, tutor, writer, year