flounder
(to move with great difficulty and effort)
- We have to flounder in the deep snow back home.
- She floundered in the water till someone dived in to save her.
(unable to decide what to do or say next)
- She floundered through her song.
- I floundered for a few seconds trying to decide what to do next.
founder
(to fail because something has gone wrong)
- Their marriage began to founder after a few months.
- The project foundered for lack of funds.
(to fill with water and sink)
- Our ship foundered on the rocks.
(a person who creates or establishes something)
- Hitler was the founder of the Nazi Party.