I understand the phrase "missionary work" when it comes to describing what full-time missionaries do - since there is much of it that absolutely can and should be classified as "work". However, for regular members, I much prefer the phrase "sharing the Gospel" - since I really don't see it as "work" in any classic sense of that word.
I share the Gospel with others, but it comes now more from a foundation of sharing what brings me joy and seeing what sticks than from expectation of conversion. I don't "hunt" or "fish with a line" anymore (meaning I don't try to identify an individual target and bring it down or reel it in); rather, now I fish with a net - or "chum" - or cast my bread upon the waters (meaning I toss my beliefs on the water and see which fish find it delicious to the taste). I don't try to "hook" anyone anymore; I simply set the table, spread the food and see who is drawn to partake. I don't condemn those who choose to refrain; I just keep repeating the process over and over and over again. I speak what I perceive to be "my truth" - what has brought me peace and joy, but I do so in full respect of the limitations and/or perspectives of those with whom I am speaking.
I'm not working; I'm sharing. The difference is important to me.