Adhesion
Adhesive
noun, verbal noun
If something sticky wears something else on it, it will stick together because there's adhesion between them.
粘着 refers to the adhesive properties of a material, especially in compound words like 粘着テープ (adhesive tape). On its own, it often describes the behavior of people who can't let go of a particular issue and keep on about it in unwanted ways.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
どうして粘着テープを宝石箱に仕舞っているの？
Why do you keep the adhesive tape in your jewelry box?