spearhead

Ara I think you can use either as an adjective though "spearheaded troop" is kinda clumsy off the tongue

I don't believe that any native speaker would say "spearheaded," using it as an adjective in such a locution.

So. "Spearhead troop " is ok ?

Yes, it is OK.

I often hear "spearheaded the action" or similar.



From a quick search on "spearheaded the action"......

"Rangers spearheaded the action by conducting two important operations"

"However, Katharine Jenner, campaign director at Consensus Action on Salt and Health who also spearheaded the Action on Sugar campaign, ..."


Etc.

That is using spearhead as a verb--Arafat is using it as an adjective. Spearhead can be used as an adjective--spearheaded cannot.

Absolutely.

I was thinking that maybe he's got a dodgy source from somewhere, and merely illustrating where it can be used.

I believe he is writing these sentences himself as a vocabulary-building exercise. Just a guess on my part, though.

Yes. I made it this sentence by myself this is my way to remember a new word .

Good for you Ara. A subscriber to Wordsmith I am forever seeking a new way to quickly ensconce a def. Sunday's word for instance

gemeinschaft

PRONUNCIATION:
(guh-MYN-shaft)

MEANING:
noun: Social relations based on personal ties, affection, kinship, etc.

The first thing pops to mind is a mine shaft. So imagine a number of workers descending in an elevator when its motor quits, when they spend the rest of the day exchanging feelings about the external world