Thread
noun
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji it should use the kun'yomi reading (which is the reading you learned with the kanji).
糸がゆるむ
the thread is loosened
糸がもつれる
the thread gets tangled
糸がほつれる
the thread comes undone
糸がほどける
the thread is untied
糸がある
there's a thread
糸を引く
to pull strings
糸を切る
to cut the thread
糸をつかう
to use a string
太めの糸
thick thread
クモの糸
a spider's thread
ナイロンの糸
nylon thread
糸のいろ
the color of the thread
糸の先
the end of the thread
糸のはし
the end of the thread
糸は、たくさんあるよ。
There are many threads.
このタオル、糸が出てる。
Threads are sticking out of this towel.
この糸を二十センチに切って下さい。
Please cut this thread to 20 cm.