Indonesia Institute of Islamic Dawah was created in 1972.

E-Dawah is the use of digital platforms and technology to convey Islamic teachings, guidance, and messages to a wide audience. It involves using social media, websites, apps, and other online tools to engage with people and educate them about Islam. E-Dawah aims to spread awareness of the religion in a modern and accessible way.

Indonesia Institute of Islamic Dawah's motto is 'Call upon to the path of thy Lord with wisdom and lessons well, and bantahlah them with a better'.

The answer is dawah.
It's five letters, ending in H. Dawah is a noun referring to missionary work in the Islam faith.

In Islam, every allowed action is an act of worship, if it is done in the spirit of worship, in the name of Allah (God.)

http://www.islam101.com/dawah/05_concept_worship.html

http://www.islamreligion.com/articles/222/