noun, の adjective
This has a little hiragana attached to it but nothing that suggests it's a verb or an adjective. That means you can assume this word has the same meaning as its parent kanji.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
You wanted to remember everything about your trip, so you bought every souvenir (すべ) available in the entire shop to ensure you had all the mementos possible.
Should I cut this entire onion?
I came to the United States, saying "goodbye" to everything in Japan.
Every person was born from a person.