Generally speaking, yes. It's a unit of potent models gathered together to protect one another and make it very difficult to eradicate in a turn or two. A deathstar is usually composed of a very powerful IC or two, strong support units that can take a lot of punishment (e.g. many wounds, great armor save, high toughness or any combination thereof) and excels at something that makes it a prime target for elimination (e.g. high powered shooting, superb CC capability, etc).
For Tyranids, popular Deathstars include a brood of three Carnifexes w/ two Tyranid Primes and a closely trailing unit of Venomthropes, or a Swarmlord w/ three Tyrant Guard and a Tyranid Prime. In the former, the majority T for the unit against shooting is 6, so the lower T5 Tyranid Primes benefit from the wounds. "Look Out, Sir!" rolls supporting the Tyranid Prime can be distributed across multiple Fexes to preserve the unit longer. And in CC, having Lash Whips/Boneswords on the Primes will allow the Fexes to go faster than those in base contact with the Primes. The Swarmlord Deathstar is built in to the codex as is with minimal effort and really only counts as a deathstar in lower point games. The Fex deathstar, though, is very, very pricey regardless what point level you play at.
The common thread between deathstars is that it's very expensive to field and thus a serious dedication in terms of how your force will function. The opponent knows getting rid of it means the rest of the battle will be a mop-up job. That's why Deathstars are a veritable "all or nothing" proposition.
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