This is the 11168th most frequent Russian word.
гранатомета
"Гранатомета" means "grenade launcher" in English.
In this sentence, "гранатомета" is used in the instrumental case to indicate the tool by which the action was performed.
Солдаты использовали гранатомета для уничтожения вражеской техники.
The soldiers used the rocket launcher to destroy enemy equipment.
Here, "гранатомета" is in the genitive case to specify possession or association.
Местные жители обсуждали опасность гранатомета, оставленного на улице.
The locals were discussing the danger of the rocket launcher left on the street.
"Гранатомету" appears in the dative case, indicating the indirect object of the movement.