Teaching
Professor
noun, verbal noun, の adjective
If you teach and instruct then you are doing teaching. Who does teaching? A professor.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
その教授は、ファイルよりも書類整理箱を好んだ。
That professor prefers filing cabinets to digital files.