Hello Vlad.
1) You can replace word tag by search this language string
COM_EASYBLOG_TAGS_PAGE_HEADING in ...\language\en-GB\en-GB.com_easyblog.ini at line 379
2) You need to delete this code in ...\components\com_easyblog\themes\default\blog.tagcloud.php at line 27 until line 44
<ul class="reset-ul float-li float-l">
<li class="sorting-item tag-title">
<a href="<?php echo EasyBlogRouter::_( $titleURL );?>"<?php echo $ordering == 'title' || empty( $ordering ) ? ' class="active"' : '';?> rel="nofollow"><?php echo JText::_( 'COM_EASYBLOG_TAGS_ORDER_BY_TITLE' );?></a>
</li>
<li class="sorting-item posts">
<a href="<?php echo EasyBlogRouter::_( $postURL );?>"<?php echo $ordering == 'postcount' ? ' class="active"' : '';?> rel="nofollow"><?php echo JText::_( 'COM_EASYBLOG_TAGS_ORDER_BY_POST_COUNT' );?></a>
</li>
<li class="ordering-item asc">
<a href="<?php echo EasyBlogRouter::_( $ascURL );?>"<?php echo $sorting == 'asc' ? ' class="active"' : '';?> rel="nofollow"><?php echo JText::_( 'COM_EASYBLOG_TAGS_SORT_BY_ASC' );?></a>
</li>
<li class="ordering-item des">
<a href="<?php echo EasyBlogRouter::_( $descURL );?>"<?php echo $sorting == 'desc' ? ' class="active"' : '';?> rel="nofollow"><?php echo JText::_( 'COM_EASYBLOG_TAGS_SORT_BY_DESC' );?></a>
</li>
<li class="tag-search">
<input type="text" id="filter-tags" name="filter-tags" class="ffa fsg fwb" />
</li>
</ul>
</div>
3) Add this css code in your custom.php or template.php file
#eblog-wrapper .post-tags li a {
font-size: 20px;
}
Hope this help