IPA: //njuːməˈkɒkəl//
KK: /nʊˈmoʊkɑkəl/
Relating to a type of bacteria that can cause infections, especially in the lungs.
The pneumococcal vaccine helps protect against serious infections.
Pneumococcal → It is formed from "pneumo-" (from Greek "pneuma", meaning breath or lung) and "coccus" (from Greek "kokkos", meaning berry or seed). The term refers to a type of bacteria that affects the lungs, hence relating to respiratory issues.
Think of 'breath' ('pneumo-') and 'berry' ('coccus') to remember that 'pneumococcal' relates to a type of bacteria affecting the lungs.
No commonly confused words.