Shooty
"Shooty" is Warhammer 40,000 player slang to describe a unit or army that is designed around ranged engagement rather than close combat. Tau armies in particular are typically shooty armies, since they have very powerful ranged weaponry but are poor at mêlée. The Imperial Guard are also sometimes considered a shooty faction, because their flashlights do more damage than their shitty melee. The orks are also very "shooty" as they just don't care what the hell they're killing with, just so long as they're killing, but they will almost never hit anything if they are more than a few inches away from their target. The green bastards can even shoot heavy weaponry while moving, which is pretty badass. Necrons are also shooty, though in prior editions they could fight pretty damned well in melee combat in a pinch, especially with disruptor fields because then they would get gauss rules at any range. These days the 'cronz have to avoid melee at all costs or risk getting mulched.
Certain Spehss Mehreen and Kay-oss Spehss Mehreen chapters/legions like the Salamanders and Iron warriors were also shooty oriented, though the 4th edition Chaos Space Marine eliminated any mechanical differences between the Traitor Legions, you can still build a shooty oriented Chaos Space Marine army though.
You can build a shooty Tyranidarmy by choosing an army primarily consisting of termagaunts, biovores, gargoyles, tyrannofexes, tervigons, venomthropes, zoanthropes and getting ranged biomorphs for warriors, raveners, shrikes, carnifexes, hive tyrants and getting the doom of Malan'tai, you'll probably lose a hell of a lot though.
Eldar armies can also be built to be shooty, but it's generally not recommended if the enemy has anything capable of closing the distance and assaulting at all.