This is the 3263rd most frequent Polish word.
szacunku
"Szacunku" means "respect" in English.
Here, 'szacunku' is the genitive singular form of 'szacunek', used after 'mam' to express possession or feeling.
Mam ogromny szacunek dla starszych ludzi.
I have great respect for elderly people.
In this case, 'szacunek' is used in the nominative form as the object of a verb to describe what was deserved.
Zasłużył na szacunek swoimi czynami.
He earned respect through his actions.
Here, 'szacunku' is in the genitive case, used after a negation of the verb 'brakuje' to express the concept of lacking.