Maven

n.capable, thoughtfuleveryday

What it means

A person with deep, trusted knowledge of a particular subject.

Reach for it when praising an informed enthusiast or expert in an accessible, slightly informal way

The neighborhood garden maven knew which plants could tolerate the shaded soil.

playful
buff
when enthusiastic knowledge grows from a hobby
not when Buff is casual and does not imply reliable professional judgment.
playful
guru
for an influential source of advice in informal speech
not when Guru appropriates a religious title and often inflates ordinary expertise.
everyday
go-to person
when others routinely seek the person's help
not when The phrase describes social reliance, not the depth or accuracy of knowledge.
warm
aficionado
when committed appreciation and knowledge of a subject matter
not when Aficionado emphasizes enthusiasm and may not include practical competence.
professional
expert
when established knowledge and competence need neutral wording
not when Expert may imply formal credentials that an enthusiast has not claimed.
professional
specialist
when expertise is focused within a defined area
not when Specialist may describe a job role rather than enthusiastic practical knowledge.
formal
authority
when others recognize the person's judgment within a field
not when Authority sounds institutional and can overstate informal community knowledge.
formal
connoisseur
when cultivated judgment about art, food, or another pleasure is central
not when Connoisseur can sound elitist and fits appreciation better than practical problem-solving.

local maven
A local maven identified the maker's mark on the old bowl.
style maven
The style maven favored durable clothes over passing novelty.
marketing maven
A marketing maven helped the cooperative explain its unusual model plainly.

Maven is informal and can sound fashionable or promotional; expert is safer where credentials and scope must be precise.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.