Image #2 could be 'Hercules-club' (Zanthoxylum clava-herculis) - the bees should love it. Look for Bi-pinnate leaves.
Would like to see an image of the bark & stems for images #1 & #3. Rusty blackhaw (or some other viburnum) sounds good; like what nietssemaj said. Not so much a dogwood.
The last one has a Sumac vibe to it. Pinnate leaves and all. More images for this one too.