Games like Synonymy
Games like Synonymy include Mini Motorways, House Flipper, Chants of Sennaar, Hook, and Bloons TD 6. We matched them by the tags players give Synonymy on Steam (Word Game, Casual, Puzzle, Education, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Mini Motorways
Shared: Casual · Puzzle · Strategy

House Flipper
Shared: Singleplayer · Casual · Relaxing

Chants of Sennaar
Shared: Puzzle · Singleplayer · Word Game

Hook
Shared: Casual · Puzzle · Abstract

Bloons TD 6
Shared: Singleplayer · Casual · Strategy

Bejeweled® 3
Shared: Casual · Puzzle · Singleplayer

Zup! S
Shared: Casual · Puzzle · Singleplayer

Plants vs. Zombies GOTY Edition
Shared: Casual · Singleplayer · Strategy

Hexcells
Shared: Casual · Puzzle · Singleplayer

Monument Valley
Shared: Puzzle · Casual · Singleplayer

Peggle Deluxe
Shared: Casual · Puzzle · Singleplayer

klocki
Shared: Casual · Puzzle · Singleplayer

Unpacking
Shared: Casual · Puzzle · Relaxing

A Little to the Left
Shared: Puzzle · Casual · Relaxing

Gorogoa
Shared: Puzzle · Casual · Singleplayer

Mini Metro
Shared: Puzzle · Strategy · Casual

Glass Masquerade
Shared: Puzzle · Casual · Relaxing

Lines X
Shared: Casual · Puzzle · Strategy

Scribblenauts Unlimited
Shared: Casual · Puzzle · Singleplayer

Dorfromantik
Shared: Puzzle · Casual · Relaxing

Assemble with Care
Shared: Casual · Puzzle · Singleplayer

LYNE
Shared: Puzzle · Casual · Relaxing

Hexcells Infinite
Shared: Casual · Puzzle · Singleplayer

Moncage
Shared: Casual · Puzzle · Singleplayer