tile, gram
瓦 centers on a baked clay tile, especially a roof tile. The 'gram' meaning is a modern phonetic borrowing unrelated to the tile sense.
瓦 is a pictograph of a roof tile, with the modern form preserving a stylized tile shape. The 'gram' reading is a modern phonetic loan unrelated to the original meaning.
The shape looks like two overlapping roof tiles with a small connecting piece. Picture a tiled roof: 瓦 is a tile.
For ガ, imagine a tile falling and making a sharp 'ga' sound as it hits the ground: ga -> ガ.
brick
tile (e.g. roof)
rubble; debris; wreckage; tiles and pebbles
collapse; downfall
Blue House (official residence of the president of South Korea); Cheong Wa Dae
decorative ridge-end tile (traditionally bearing the face of a demon and resembling a gargoyle)
tile-roofing
chamotte brick
cement roof tile; cement tile
convex roof tile
ornamental tile; facing bricks
complete collapse; (something) going to pieces (breaking up beyond repair)
sun-dried brick; adobe
roof tile
comma-pattern tile
concave roof tile
Nippon Gas
wooden block
pantile
ridge tile