What kind of noun is knowledge?

Abstract noun:
- We define abstract nouns as nouns that you can’t directly experience by any of the human senses.
- These nouns represent an aspect, concept, idea, experience, state of being, trait, quality, or emotion.
- You may feel them emotionally, but not with your sense of touch.
- সহজ ভাষায় বলতে গেলে, যে Noun  গুলো ইন্দ্র্রিয়গ্রাহ্য বা  touchable  নয় সেগুলোই Abstract noun. Examples: Humor, Kindness, Intelligence ইত্যাদি।  

Knowledge: 
 [নলিজ্‌] (noun)
(১) জ্ঞান; অবগতি: He has little knowledge of English.
(২) অভিজ্ঞতা: I have no knowledge of mountaineering.
(৩) জ্ঞানের পরিধি: To the best of my knowledge, he is a reliable person. The girl took up acting without the knowledge of her parents. knowledgeable (adjective) জানাশোনা; অভিজ্ঞ; জ্ঞানসম্পন্ন।

So, Knowledge is an abstract noun.