Load all titles and body text from one content type into array

HI all,

I'm working on an input format filter that should work as following. I have a content-type called glossary, the user can fill in a word (title) and description (body). Then there is a content-type article. When a word in the article matches a word in the glossary it should wrap that word with a span. Something like word. I already did a quick and dirty tryout and that worked fine. I already did a speed test and it worked out fine only a delay of 0.2s max. But now I try to make it as it should and I got stuck.

The way I think this could work is to have an array with all words and descriptions from the glossary content-type in a array. And then search through the text.

So I created a Plugin/Filter/Filtername.php file. In this file I try to load all node from the glossary content-type (as advised) via dependency injection.

What I found is a way to get all nids, via this code added in to my filter class:

    class FilterName extends FilterBase {
        public function __construct(QueryFactory $entity_query)
        {
            $this->entity_query = $entity_query;
        }
    
        public static function create(ContainerInterface $container){
            return new static(
              $container->get('entity.query')
            );
        }
    
        public function process(){
            $query = $this->entity_query
            $query->condition('bundle','woordenlijst');
            $nids = $query->execute();
        }
    }

So this should give me all nids of the node I'm looking for but how do I get these node loaded to get there title and body text? I found this lesson about entity loading. Which is usefull but there are some deprecated functions used and I have no idea how to combine these to to get een array of titles and body texts.

So what is currently the best method to load nodes and how can I combine this with the code I already have? And am I even on the right path or not, or is there a better/easier way to do this?

Thanks in advance.