superbase

https://doi.org/10.1351/goldbook.08211
Compound having a very high basicity.

Examples: Amide bases such as lithium diisopropylamide (LDA), potassium tert-butoxide + organolithium, some phosphazenes.

Source:
PAC, 2022, 94, 353. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 2021)) on page 512 [Terms] [Paper]