A first option would be Blue Griffon http://bluegriffon.org It now has a payed version but the free one is good enough for this.
You will need probably need to strip some tags that are inserted every time you enter the design mode.
Another option is https://www.seamonkey-project.org
But if the text is quite long or you have already "taged" in Word it is probably easier to strip the attributes of the generated html.
Sometimes this aproach is faster because in the previous programs you need to select the text to be tagged.
Using Word you can go much faster using the arrows and assigning shortcuts to the tags, for example I prepared some time ago a template to assign Ctrl+1 to header 1, Ctrl+2 to header 2 upt to trl+5 that is a normal paragraph.
Take a look at this search on this same site: https://softwarerecs.stackexchange.com/search?q=html+strip