Play NYT Connections Puzzle #408 Wed, Jul 3

Find groups of four related words Need hints?

Solve NYT Connections puzzle #408 - Group 16 words into 4 categories: BRAINSTORM, IDEATE, SPITBALL, WORKSHOP, CONCRETE, MATERIAL, REAL, SOLID, BIRTHDAY, CRUMB, MARBLE, POUND, CURVEBALL, PARTY, TANTRUM, WRENCH.