This is the 142nd most frequent Marathi word.
सहक
Companion or partner.
The word 'सहक' is used here as an adjective, meaning 'cooperative' or related to working together.
तुम्ही भविष्यात सहक विधींचा विचार करावा.
You should consider cooperative methods in the future.
Here, 'सहक' describes the nature of the research project as being collaborative.
त्यांनी संशोधनाच्या सहक प्रकल्पात सहभाग घेतला.
They participated in a collaborative research project.
In this sentence, 'सहक' relates to the concept of cooperation as an abstract idea.