This is the 16872nd most frequent Russian word.
советников
"Advisors" or "counselors."
Here, 'советников' is in the plural accusative case, used to denote the object of the verb 'пригласили' (invited). It refers to multiple advisors as the participants of the meeting.
Советников пригласили на собрание.
Advisors were invited to the meeting.
In this sentence, 'советников' is in the plural genitive case, used to express possession or relation, indicating that the important information belongs to the advisors.
У советников есть важная информация.
The advisors have important information.
Here, 'советников' is in the plural genitive case as employed after the noun 'группа' (group), to describe the composition of the group consisting of advisors.