This is the 8785th most frequent Japanese word.
本能
Instinct.
The word '本能' (instincts) is used to describe innate behavioral patterns inherent to humans.
本能は人間の行動に大きな影響を与える。
Instincts have a significant impact on human behavior.
Here, '本能的' is an adjectival form, relating actions directly to instincts.
動物の本能的な反応について考えるのは面白い。
Thinking about animals' instinctive reactions is interesting.
The word '本能' in this sentence emphasizes acting from innate feelings and impulses.