5K is 5120 x 2880

4K is 3840 x 2160 (typical monitor resolution); 4096 x 2160 (official cinema resolution)

Ultra HD (UHD) is 3840 x 2160

QHD aka WQHD aka 1440p is 2560 x 1440

2K is 2560 x 1440 (typical monitor resolution); 2048 x 1080 (official cinema resolution)

WUXGA is 1920 x 1200

Full HD aka FHD aka 1080p is 1920 x 1080

HD aka 720p is 1280 x 720