Removing PSA

Can a single word trigger PSA?

[chikung]

Well, this may sound stupid but I think one single word may trigger bunch of PSA, like "Services" etc. Can anyone put more light on this topic.If we remove that word, will that help removing PSA?

[Jenstar]

PSA triggering words [webmasterworld.com]

Words that cause PSAs [webmasterworld.com]

Those AdSense charity ads won't go away [webmasterworld.com]

There definitely are stop words, however, I am nearly positive that services is not one of them.

[anallawalla]

There are many AS publishers who can be found by searching for Services and "ads by google". Think Financial Services, Web Services, etc and you'll see it is a legit word.